Island



(No Model.)

J. W. SARGENT.

EXHAUST VALVE FOR STEAM ENGINES. No. 545,414. Patented Aug. 2'7, 1895.

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JOHN V. SARGENT, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO THE RICE &SARGENT ENGINE COMPANY, OF SAMEPLACE.

EXHAUST-VALVE FOR STEAM-ENGINES.

ESPECITEICATION forming part of Letters Patent No. 545A14, dated August27, 1895.

Application filed May 9, 1895- fierlal No. 548,729 (No model) To allwhom it 'nmy concern.-

Be it known that I, JOHN \V. SARGENT, a citizen of the United States,residing at Providence, in the State of Rhode Island, have invented anew and useful Improvement in haust-Valves for Steam-Engines, of whichthe following is a specification.

The nature of my invention consists in the improved construction andarrangement of the oscillating exhaust-valveof a steam-engine, ashereinafter set forth and claimed.

In the accompanying drawings, Figure 1 represents an axial section ofthe outer end portion of the cylinder of a steam-engine provided with myimproved exhaust-valve. Fig. 2 represents a vertical section taken inthe line 2 2 of Fig. 1. Fig. 3 represents a detail section taken in theline 3 3 of Fig. 1. Fig. 4. represents an enlarged top view, and Fig. 5an end view, of the exhaust-valve removed from the cylinder. Fig. 6represents a rear side view of the valve as shown in Fig. 4. Fig. 7represents a transverse section taken in the line 7 7 of Fig. 6. Fig. 8represents a transverse section taken in the line 8 8 of Fig. 6.

In the draw ngs, A represents the enginecylinder; 13, the piston; C, theinlet-valve; D, the cylinder-head; E, the exhaust-valve, and F thesteam-exhaust passage extending from the double exhaustports act at thevalve. The exhaust-valve E is located so that its central axis will lieat or near the line of the bottom of the bore of the cylinder, whilehorizontally the periphery of the valve is brought forward to about theline of the inner face 6 of the cylinder-head D. The forward edge h ofthe valve E is made straight and the valve is provided with one or morepassages 0, through which the steam is guided to the port a. The valve Eis also provided with the rearwardly-curved edge d, which is so formedthat the piston 13 may be removed from the cylinder A withoutnecessitating the removal of the valve. The face 6 of the cylinder-headD is cut away at f in curved form, in order to provide ample space forthe passage of steam from the cylinder A to the valve E, and the curvededge dot the Valve is preferably made to overhang at the points gg, inorder that the steam may have free lateral passage to the outer ends ofthe passages 0 under the overhanging edge (1 and at the same time thesteam clearance space between the cylinder and the exhaust-ports bereduced to a practical minimum.

I claim as my invention- 1. The combination with a cylinder having anexhaust-port and a valve-seat intersecting th ore of the cylinder, of avalve cut away to a- )w the removal of the piston, without necessitatingthe removal of the valve.

2. The combination with a cylinder, having an exhaust-port and avalve-seat intersecting the bore of the cylinder of a valve having itsfront edge straight, and its rear edge curved, to allow the removal ofthe piston without necessitating the removal of the valve.

3. The combination with a cylinder having an exhaust-port, and avalve-seat intersecting the bore of the cylinder, of a valve providedwith a steam passage, and having its front edge straight, and its rearedge overhanging the outer ends of the steampassage of the valve, andcurved to allow the removal of the piston, without necessitating theremoval of the valve.

4. The combination with a cylinder having an exhaust port, and a valveseat intersecting the bore of the cylinder, of a valve provided with asteam passage, and having its front edge straight, and its rear edgeoverhanging theouter ends of the steam passage of the valve,substantially as described.

JOHN XV. SARGENT.

itnesses:

v Soonnrns SCHOLFIELD,

Bnoz Y. LINDGREN.

